1553964091 has 2 divisors, whose sum is σ = 1553964092. Its totient is φ = 1553964090.

The previous prime is 1553964089. The next prime is 1553964109. The reversal of 1553964091 is 1904693551.

Together with next prime (1553964109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1553964091 - 2¹ = 1553964089 is a prime.

It is a super-2 number, since 2×1553964091² = 4829608792234912562, which contains 22 as substring.

Together with 1553964089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1553934091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776982045 + 776982046.

It is an arithmetic number, because the mean of its divisors is an integer number (776982046).

Almost surely, 2^1553964091 is an apocalyptic number.

1553964091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1553964091 is an equidigital number, since it uses as much as digits as its factorization.

1553964091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145800, while the sum is 43.

The square root of 1553964091 is about 39420.3512287752. The cubic root of 1553964091 is about 1158.2802725218.

The spelling of 1553964091 in words is "one billion, five hundred fifty-three million, nine hundred sixty-four thousand, ninety-one".